PCC-IV Instruction Manual (Rev. 0.1)
Page 6-12
Section 6
– Blockware Functions
Technical Reference
The Blockware Example shows typical applications of the FPT/H function. Block 14 is the
FPT/H
Manual/Auto
station for the control loop. Before the burner releases to modulation, the
FPT/H
"TM" Input and the
PID
"TM" Input
force both Blocks to Track the Firing Rate Output (Block 20). This insures a bumpless, balance-less transfer from
light-off to modulate.
The second
FPT/H
, Block 10, is used to implement a remote setpoint with local manual override strategy. In Remote
mode, the
PID
setpoint will be the Remote setpoint. When the Operator presses the pushbutton to put the controller
in Local setpoint mode, the setpoint will initially be held at the most recent remote setpoint, and the Operator can
then adjust it to any desired value. The Transfer Rate Limiting would be used to prevent a rapid setpoint change
when transferring from Local Setpoint mode back to Remote Setpoint mode.
